GPT-5.1 Thinking vs Kimi-k1.5: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Thinking | Kimi-k1.5 |
|---|---|---|
| Company | OpenAI | Moonshot AI |
| Release Date | November 11, 2025 | January 20, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 256K | — |
| Context (output) | 128K | — |
| Input Price / 1M | $3.00 | — |
| Output Price / 1M | $12.00 | — |
| Average Score | 0.9 | 0.8 |
| Benchmarks | ||
| MMMU | 0.8 | 0.7 |
Visual Benchmark Comparison
GPT-5.1 Thinking
Kimi-k1.5
MMMU0.8 vs 0.7
0.8
0.7
Verdict
GPT-5.1 Thinking leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.1 Thinking — 0.9, Kimi-k1.5 — 0.8.
Recency
GPT-5.1 Thinking is newer: released 11/11/2025 vs 1/20/2025.
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Thinking or Kimi-k1.5?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.1 Thinking or Kimi-k1.5?
API pricing data is available on the individual model pages.
Which has a larger context window — GPT-5.1 Thinking or Kimi-k1.5?
Context window data is available on the individual model pages.
The GPT-5.1 Thinking and Kimi-k1.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.1 Thinking or Kimi-k1.5 page. See also the complete list of AI model comparisons.